package com.yjyw.tiexie.util;

import android.text.TextUtils;

import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

/**
 * Created on 2019/7/23.
 *
 * @author ${AUTHOR}
 * TODO:
 */
public class Md5Util {
    private static char[] hexDigits = {'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F'};

    /**
     * MD5加密
     *
     * @param source
     * @return
     */
    public static final String MD5Encrpytion(byte[] source) {
        try {
            MessageDigest mdTemp = MessageDigest.getInstance("MD5");
            mdTemp.update(source);
            byte[] md = mdTemp.digest();
            int j = md.length;
            char[] str = new char[j * 2];
            int k = 0;
            for (int i = 0; i < j; ++i) {
                byte byte0 = md[i];
                str[(k++)] = hexDigits[(byte0 >>> 4 & 0xF)];
                str[(k++)] = hexDigits[(byte0 & 0xF)];
            }
            for (int m = 0; m < str.length; ++m) {
                if ((str[m] >= 'a') && (str[m] <= 'z')) {
                    str[m] = (char) (str[m] - ' ');
                }
            }
            return new String(str);
        } catch (Exception e) {
        }
        return null;
    }

    public static String md5(String string) {
        if (TextUtils.isEmpty(string)) {
            return "";
        }
        MessageDigest md5 = null;
        try {
            md5 = MessageDigest.getInstance("MD5");
            byte[] bytes = md5.digest(string.getBytes());
            String result = "";
            for (byte b : bytes) {
                String temp = Integer.toHexString(b & 0xff);
                if (temp.length() == 1) {
                    temp = "0" + temp;
                }
                result += temp;
            }
            //转大写
            return result.toUpperCase();
        } catch (NoSuchAlgorithmException e) {
            e.printStackTrace();
        }
        return "";
    }

}
